Has that actually been confirmed or just a guess?
I was taking the logic that you get more xp because of the added risk of opponents being re-awakened by other enemies..
After all, if they're unconscious, there's nothing really stopping you from rifling their bodies..
It was actually something that was brought up in the gamebanshee preview. There was a comment about extra XP being awarded with a "Ghost" tag which I assume is for getting through an area completely unseen. I'm just guessing, but I wouldn't think you'd get that bonus if you went around knocking everyone out with stealth takedowns.
The reason for the extra stealth XP is probably a combination of factors.
Ah I was more referring to if you ko someone, you should still be able to loot them..
One of the reviews talked about how killing someone gets you 10xp, but knocking them out was worth 20xp...
Although I could almost foresee some twinkies seeing if they could farm xp that way by knocking them out, waiting for them to be woken up then go back to ko them once more...